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ADSL running slow on Cisco router.

Hi Guys,

One of my routers seems to be running slow, I have done a "show interface" and the interface that appears to be running the ADSL shows the following. To me, it appears that the ADSL is syncing at 8829 Kb/s but the ATM0 interface has been configured to use a maximum of 939 Kb/s (BW 939 Kbit/sec). Is that correct?

Can I change it to the maximum the interface allows?

ATM0/0/0 is up, line protocol is up
   Hardware is HWIC-DSLSAR (with Alcatel ADSL Module)
   MTU 4470 bytes, sub MTU 4470, BW 939 Kbit/sec, DLY 540 usec,
      reliability 255/255, txload 23/255, rxload 216/255
   Encapsulation ATM, loopback not set
   Encapsulation(s): AAL5  AAL2, PVC mode
   23 maximum active VCs, 256 VCs per VP, 1 current VCCs
   VC Auto Creation Disabled.
   VC idle disconnect time: 300 seconds
   Last input 00:31:25, output 00:00:00, output hang never
   Last clearing of "show interface" counters never
   Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
   Queueing strategy: Per VC Queueing
   5 minute input rate 1034000 bits/sec, 175 packets/sec
   5 minute output rate 85000 bits/sec, 55 packets/sec
      363574 packets input, 272762690 bytes, 0 no buffer
      Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
      0 input errors, 164 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
      132374 packets output, 26785767 bytes, 0 underruns
      0 output errors, 0 collisions, 0 interface resets
      0 unknown protocol drops
      0 output buffer failures, 0 output buffers swapped out

A "show dsl interface":

ATM0/0/0
Alcatel 20190 chipset information
                 ATU-R (DS)                      ATU-C (US)
Modem Status:    Showtime (DMTDSL_SHOWTIME)
DSL Mode:        ITU G.992.5 (ADSL2+) Annex A
ITU STD NUM:     0x03                            0x2
Chip Vendor ID:  'STMI'                          'IFTN'
Chip Vendor Specific:  0x0000                    0x8277
Chip Vendor Country:   0x0F                      0xB5
Modem Vendor ID: 'CSCO'                          '    '
Modem Vendor Specific: 0x0000                    0x0000
Modem Vendor Country:  0xB5                      0x00
Serial Number Near:    FOC12250RAFCISCO73993206
Serial Number Far:  Chip ID:     C196 (0)
DFE BOM:         DFE3.0 Annex A (1)
Capacity Used:   100%                            100%
Noise Margin:    -4.0 dB                          9.0 dB
Output Power:     9.5 dBm                        -4.0 dBm
Attenuation:     30.0 dB                         16.0 dB
FEC ES Errors:    0                               0
ES Errors:        1                               0
SES Errors:       1                               0
LOSES Errors:     1                               6
UES Errors:       0                              153
Defect Status:                       LOM     None
Last Fail Code:  None
Watchdog Counter: 0xBC
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction:     0x00
Interrupts:      4174 (0 spurious)
PHY Access Err:  0
Activations:     1
LED Status:      OFF
LED On Time:     0
LED Off Time:    0
Init FW:         init_AMR-3.0.014_no_bist.bin
Operation FW:    AMR-3.0.014.bin
FW Source:       embedded
FW Version:      3.0.14

                  DS Channel1      DS Channel0   US Channel1       US Channel0
Speed (kbps):             0             8829             0               939
Cells:                    0          7334465             0           5473687
Reed-Solomon EC:          0                0             0                 0
CRC Errors:               0             1429             0                 0
Header Errors:            0              430             0                 0
Total BER:                0E-0           5249E-9
Leakage Average BER:      0E-0           5249E-9
Interleave Delay:         0               41             0                60
                         ATU-R (DS)      ATU-C (US)
Bitswap:               enabled            enabled
Bitswap success:          0                   0
Bitswap failure:          0                   0

Thanks,

Dario

2 Accepted Solutions

Accepted Solutions

Leo Laohoo
Hall of Fame
Hall of Fame
reliability 255/255, txload 23/255, rxload 216/255

Your DSL is slow because something is coming into your router from the WAN.  It's chewing 85% of your bandwidth.

Noise Margin:    -4.0 dB                          9.0 dB

Aaaaand you have a bad line.  -4?  That's awful.

View solution in original post

johnlloyd_13
Level 9
Level 9

hi dario,

the bandwidth configured on the ATM interface has no bearing unless you're running some dynamic routing protocol on your network.

but based on your show interface atm0/0/0 output, you've had a high download rate (see rx load)

View solution in original post

5 Replies 5

Leo Laohoo
Hall of Fame
Hall of Fame
reliability 255/255, txload 23/255, rxload 216/255

Your DSL is slow because something is coming into your router from the WAN.  It's chewing 85% of your bandwidth.

Noise Margin:    -4.0 dB                          9.0 dB

Aaaaand you have a bad line.  -4?  That's awful.

spot on leo! i've always pay attention to DSL attenuation.

dario,

you'll need to engage with your SP on this issue.

Thanks John.

johnlloyd_13
Level 9
Level 9

hi dario,

the bandwidth configured on the ATM interface has no bearing unless you're running some dynamic routing protocol on your network.

but based on your show interface atm0/0/0 output, you've had a high download rate (see rx load)

Thanks guys. The bad-connectivity problem is a long standing one and maybe you could help me figure out a solution.

show  int  Dialer 0

Dialer0 is up, line protocol is up (spoofing)

  Hardware is Unknown

  Description: ADSL2+ Connection to Internet

  Internet address is 203.161.99.68/32

  MTU 1450 bytes, BW 56 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 54/255, rxload 202/255

  Encapsulation PPP, loopback not set

  Keepalive set (10 sec)

  DTR is pulsed for 1 seconds on reset

  Interface is bound to Vi1

  Last input never, output never, output hang never

  Last clearing of "show interface" counters 1d06h

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: weighted fair

  Output queue: 0/1000/64/0 (size/max total/threshold/drops)

     Conversations  0/0/16 (active/max active/max total)

     Reserved Conversations 0/0 (allocated/max allocated)

     Available Bandwidth 42 kilobits/sec

  5 minute input rate 157000 bits/sec, 36 packets/sec

  5 minute output rate 12000 bits/sec, 3 packets/sec

     14808702 packets input, 1505222362 bytes

     6953355 packets output, 2010317578 bytes

At a first sight it seems that there is not a great internet connection. Is there any way to have a report like this for a time frame shorter than 5 mniutes?

Thanks,

Dario

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